Renewal electric fuse plug



Sept. 27, 1949. E. MELTZER RENEWAL ELECTRIC FUSE PLUG Filed Jan. 8, 1948JNVEN TOR. inizi/JV JYZYZZJ? BY CM 'UQ/@w fyi/'TORNEI Patented Sept. 27,1949 UNITED STATES PATENT OFFICE) RENEWAL ELECTRIC FUSE PLUG EvelynMeltzer, Brooklyn, N. Y.

Application January 8, 1948, Serial No. 1,169

2 Claims. (Cl. ZOO-430) My invention relates to improvements in renewalor refillable fuse plugs.

The major object of my invention is to provide an electric fuse plug ofsuch design and construction wherein it is possible for the layman toremove the ruptured or burned-out fuse element and to insert a newelement with ease and without the need or use of any tools.

Other objects of my invention are to provide a renewal or rellable fuseplug which is simple of design and construction, is inexpensive tomanufacture, eliminates screws, rivets, soldering and the like for thereplacement of the fuse element, simplifies assembly, is efficient inoperation, and meets the requirements of the Underwriters Code.

Another object of my invention is to provide a refillable fuse plughaving such body design which simplifies the molding thereof and reducesmold costs, and especially lends itself to be cold molded from coldmolding plastics.

For a better understanding of the invention, reference may be had to thefollowing detailed description taken in connection with the drawingoriginally filed, in which Fig. 1 is a side elevational view of therefillable fuse plug embodying the features of the present invention.

Fig. 2 is a sectional View taken on line 2--2 of Fig. 1, with the fuseelement in place.

Fig. 3 is a fragmentary sectional View illustrating the manner in whichthe fuse element is inserted into the plug parts to renew or refill thesame.

Fig. 4 is a fragmentary traverse sectional view taken on line 4-4 ofFig. 2.

Fig. 5 is a perspective view of the fuse element.

Referring now to the figures, I represents the main section of the bodyof the plug and I2 represents the secondary section of the body of theplug. These two sections are held together by a threaded metallic sleeveII which serves to retain and make contact with one of the terminals ofthe fuse receptacle. The body sections IU and I2 are made from anyelectrical insulating material such as glass, porcelain, Bakelite etc.,but preferably from cold molding plastic. I3 is a metallic spring liketerminal bent hair-pin like at I and serves to grip and make contactwith one end of the `fuse element I6. The terminal I3 may be made fromflat or round spring wire but preferably from semiround bobby-pin wire.This terminal is held in position and secured between the parts I0 andI2. The terminal I3 connects with the threaded sleeve II through asoldered joint I4. The hairpin like formation I5 of the terminal I3serves to receive and retain in spring pressed relationship a removablefuse element I 6. The said formation I5 eliminates the need of a screwor other means for securing the fuse element I6. The spring portion I5springs outwardly to receive the element IS which is inserted through anopening I'I in the part I2. A tight contact is thereby obtained. Thefuse element I6 is weakened at I8 and when an overload of current isapplied to the fuse, the fuse element will be severed at I8. The upperend of the element I6 is secured in position by being bent over theupper end of part I2 as indicated at i9 and is extended into a slot 2liof the part designed to receive the bent end I9. The orifice in part I2is closed by a contact metallic cap 2l which is screw threaded onto thepart I2 and is adapted to bear downwardly upon the upper end of the bentover portion I9 of the element I6 and thereby makes a secure contactwith the element I6. The cap 2| serves as the second terminal in contactwith the fuse receptacle. The cap 2| can be easily removed by hand,without the need or use of tools, to release the portion of the fuseelement I6 which is left after the same has been severed and the holeI'I provides access to remove other portions which may still be in unionwith the hairpin portion I5.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claims.

Having thus set forth and disclosed the nature of my invention, what isclaimed is:

1. A fuse plug of the class described, requiring no use of tools for theremoval or for the replacement of the fuse element, comprising a bodymade up of two sections and having an opening in each section, saidsections arranged to retain securely in position a wire terminalextended across the openings, a wire terminal adapted to receive andhold securely without the need of a screw or the like one end of a fuseelement, a removable terminal engaging with the opposite end of the fuseelement and adapted to have engagement with a fuse receptacle contact,said removable terminal comprising a threaded cap which may be removedby hand.

2. A fuse plug of the class described, requiring no use of tools for theremoval or for the replacement of the fuse element, comprising a 3 bodymade up of two sections and having an opening in each section, saidsections arranged to retain securely in position a Wire terminalextended across the openings, a wire terminal having a portion thereofbent hairpin like and adapted to receive and hold securely one end of afuse element, a removable terminal engaging with the opposite end of thefuse element and adapted to have engagement with a fuse receptaclecontact, sad removable terminal comprising a threaded cap which may beVremoved by hand.

EVELYN MELTZER.

REFERENCES CITED The following references are of record in the le ofthis patent:

5 UNITED STATES PATENTS| Number Name Date 1,186,090 Hanson June 6, 19161,384,028 Baxter July 5, 1921 10 1,496,405 Begehr 1 June 3, 1924

